C# Check if a decimal has more than 3 decimal places?

Question

I have a situation that I cannot change: one database table (table A) accepts 6 decimal places, while a related column in a different table (table B) only has 3 decimal plac

Answer 1

    bool CountDecimalPlaces(decimal input)
    {
        return input*1000.0 == (int) (input*1000);
    }